The Mouser name is either an occupational name for a vermin controller, or more likely in the Middle Ages was a nickname. It is found primarily in the East Anglia, specifically Norfolk and SuffolkCullingford is of Anglo-Saxon origin, and is a locational name from either Gulliford, a hamlet near Exmouth in Devon, or Colyford, a village near Colyton in Devon. The word itself is derived from the Olde English personal name "Cula", from a Germanic root "kul", swollen, with the Olde English "ford", a shallow river crossing.

Current research identifies the earliest known ancestor of our Mouser Cullingford line as being William Mouser Samuel Cullingford of Suffolk. Williams great Samuels great grand-daughter Lucy Mouser married John Jessop who emigrated to Australia in 1838 after her death.

The Mouser ancestry goes back 11 10 generations and biographies exist for some members as indicated by links

• William Mouser Samuel Cullingford married ElizabethWilliam Mouser 1721 married Mary AndrewsWilliam Mouser 1746 - 1827 married Hannah FlatmanWilliam Mouser 1771 - 1824 married Lucy CullingfordHannah
  • Everett Cullingford 1735 - 1814 married Elizabeth Dowsing
    • Lucy Cullingford ~1773 - 1839 married William Mouser  
      • Lucy Mouser 1795 - 1836 married John Jessop 
        • John Jessop 1834 - 1906 married Sarah Ann Burgess 
          • John Crofton Jessop 1861 - 1910 married Hannah Shoobridge
            • Sydney Walter Jessop 1887 - 1973 married Emily Louisa McDermott
              • Esmond Earl Jessop 1915 - 2000 married Mary Agnes Darrough
                • My Mother